Reference
Paper sizes
A short, practical reference for the paper sizes you actually use. The ISO A-series is the international standard; US Letter and its relatives are still dominant in North America. Pick a size below for full dimensions and pixel resolutions at common DPI values.
ISO 216 A-series
The international standard
Each A-size is exactly half the area of the size above it, cut along the long edge. This keeps the proportion constant: every A-size has the same 1 : √2 aspect ratio.
A0
33.11 × 46.81 in841 × 1189 mm
The base sheet of the ISO 216 A-series. Each smaller A-size is exactly half of the one above it, cut along the long edge.
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A1
23.39 × 33.11 in594 × 841 mm
Half of A0. A common indoor poster size and a frequent choice for technical drawings.
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A2
16.54 × 23.39 in420 × 594 mm
Half of A1. Often used for medium posters and presentation boards.
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A3
11.69 × 16.54 in297 × 420 mm
Twice the area of A4. The largest size most office printers handle.
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A4
8.27 × 11.69 in210 × 297 mm
The everyday office and document size used across most of the world.
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A5
5.83 × 8.27 in148 × 210 mm
Half of A4. A practical size for notebooks, leaflets and small flyers.
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A6
4.13 × 5.83 in105 × 148 mm
Half of A5. Common for postcards, pocket notes and small invitations.
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US sizes
North American paper
Defined in inches rather than millimetres. Common in the US, Canada, parts of Mexico and the Philippines.
US Letter
8.5 × 11 in215.9 × 279.4 mm
The standard office paper in the United States, Canada and a few other countries. 8.5 × 11 in.
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US Legal
8.5 × 14 in215.9 × 355.6 mm
Same width as Letter but longer (8.5 × 14 in). Used for legal forms and longer documents.
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Tabloid / Ledger
11 × 17 in279.4 × 431.8 mm
Twice the area of Letter. 11 × 17 in. Used for newsletters, posters and spreadsheets.
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When to use ISO vs US sizes
If you are designing for a worldwide audience, ISO sizes (especially A4 and A5) reach a much larger share of printers and print shops. If your audience is primarily in North America, sticking with US Letter avoids reflowing layouts that were optimised for 8.5 × 11 in.
Mixing sizes in one document
A4 (210 × 297 mm) and US Letter (216 × 279 mm) are close enough that text often reflows cleanly, but the proportions are subtly different. For graphics that must align with the paper edge, design for the exact target size from the start rather than converting later.